package com.neuedu.shop.util;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class CommonUtil {
    private CommonUtil(){}

    /**
     * 使用md5加盐算法加密字符串
     *  str 加密之前的字符串
     *  md5 算法加密之后的字符串
     */

    public static String getMD5(String str){
        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(
                    str.getBytes());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有这个md5算法！");
        }
        String md5code = new BigInteger(1, secretBytes).toString(16);
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code;

    }
}
